Exercise device



FIG. 1 is a perspective view of an exercise device;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a left-side elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top plan view thereof.

The broken line portions are included for the purpose of showing environmental structure and forms no part of the claimed design. 

The ornamental design for an exercise device, as shown and described. 